# DevX Agent Tools – Payment Request Generator (EIP-681/BIP21/Solana Pay)

> DevX Agent Tools – Payment Request Generator (EIP-681/BIP21/Solana Pay) is a paid API for AI agents from devx-x402-tools.nextill-pos.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Generates a standards-compliant crypto payment request URI (EIP-681, BIP21, or Solana Pay) with an accompanying QR code SVG for a given recipient address, token, amount, and chain.

## Facts

- Endpoint: GET https://devx-x402-tools.nextill-pos.workers.dev/v1/payment/request?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/devx-agent-tools-payment-request-generator-eip-681-bip21-solana-pay-b8405fe9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f8sIdK95EznTXsiJaoMMD

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability devx-agent-tools-payment-request-generator-eip-681-bip21-solana-pay-b8405fe9
```

Example prompt: Can you generate a USDC payment request QR code for 25 USDC on Base to my address 0xe30c...abcd, with the label 'Invoice #42'?

## When to prefer this

Use this endpoint when you need to generate a human-scannable or machine-readable crypto payment request in a standard URI format (EIP-681, BIP21, or Solana Pay) complete with a ready-to-render SVG QR code — especially in agent workflows, invoicing, or checkout flows where no API key or pre-registration is possible and pay-per-call via x402/USDC is acceptable.

## Known failure modes

- Invalid or malformed recipient address returns an error and is not charged
- Unsupported chain or token combination returns an error
- Missing required query parameters (to, amount) results in a 4xx error
- Upstream generation failure returns an error without charging
- Amount not parseable as a valid numeric value triggers validation error

## How this service works

Pay-per-call utilities for AI agents, no API key or signup: read any web page as clean Markdown ($0.002), link/SEO metadata ($0.001), domain DNS + SPF/DMARC email-security audit ($0.003), ERC-20 token safety pre-check ($0.005), crypto address validation, on-chain payment verification, EIP-681/BIP21/Solana Pay payment requests with QR, multichain USDC balances ($0.01). x402 v2, USDC on Base. Invalid input / upstream failure is never charged.

## Output

Returns a JSON object containing: a standards-compliant payment request URI (e.g. EIP-681 ethereum: URI, BIP21 bitcoin: URI, or Solana Pay URI), an SVG QR code encoding that URI for display or printing, and a string identifying which payment standard was used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "to",
      "amount"
     ],
     "properties": {
      "to": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "label": {
       "type": "string"
      },
      "token": {
       "type": "string"
      },
      "amount": {
       "type": "string"
      },
      "message": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "uri": "ethereum:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913@8453/transfer?address=0xe30c...&uint256=25000000",
  "qr_svg": "<svg ...>",
  "standard": "EIP-681"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/devx-agent-tools-payment-request-generator-eip-681-bip21-solana-pay-b8405fe9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from devx-x402-tools.nextill-pos.workers.dev](https://www.zero.xyz/host/devx-x402-tools.nextill-pos.workers.dev/llms.txt)